Twenty others were injured in what Texas Gov. Greg Abbott called “the largest mass shooting in our state’s history.”

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Reports say that a 26-year-old Air Force veteran, dressed entirely in black, began firing before he entered the church, which is roughly 30 miles south of San Antonio, at about 11:20 a.m.

“My dad saw the gunman run into the church building and then he heard shots and saw people running,” David Flores told CNN. “People covered in blood and screaming. It was pandemonium everywhere.”

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The gunman fired toward those on the right side of the building, witnesses say.

As the shooter left the church, an armed citizen pursued him and, with the help of a passerby in a vehicle, began a chase that led into neighboring Guadalupe County.

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“I never got a look at him. I never really saw him,” passerby Johnnie Langendorff, said. However, the unnamed armed citizen who ran up to his car “briefed me quickly on what had just happened and said we had to get him, and so that’s what I did,”

“The vehicle was in sight and I was picking up, getting closer and closer to it. We hit about 95 (mph) … trying to catch this guy until he eventually lost control on his own and went off into the ditch,” Langendorff said.

“The gentleman that was with me got out and rested his rifle on my hood and kept it aimed at him (shooter), telling him to get out. There was no movement, there was none of that. I just know his brake lights were going on and off, so he might’ve been unconscious from the crash or something like that. I’m not sure.”

The gunman was found dead by authorities in his vehicle of a gunshot wound, although authorities “don’t know if it was a self-inflicted gunshot wound or if he was shot by the local resident.”

In a statement from Japan, where he is on a state visit, President Trump called the shooter a “very deranged individual.”

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“This isn’t a guns situation,” Trump said, according to Fox News. “This is a mental health problem at the highest level. It’s a very, very sad event.”

Sunday’s shooting represents the second major mass shooting in a house of worship in a little over a month. On Sept. 24, Emanuel Kidega Samson killed one and injured several at the Burnett Chapel Church of Christ in Antioch, Tennessee as an apparent act of retaliation for the December 2016 Charleston church shooting by white supremacist Dylann Roof.